Hack-saw



(No Model.)

- L; L. DAVIS.

HACK SAW-.

Patented Mar. 7,1893.

messes:

NITE STATES.

PATENT OFFICE.

LEONARD L. DAVIS, OF SPRINGFIELD, MASSACHUSETTS.

HACK-SAW.

SPECIFICATION forming part of Letters Patent No. 492,937, dated March 7,1893.

Application filed March 31 1892. Serial No. 427,199- (No model.)

To all whom it may concern:

Be it known that I, LEONARD L. DAVIS, a citizen of the United States,residing at Springfield, in thecounty of Hampden and State ofMassachusetts, have invented new and-useful Improvements in Hack-Saws,of which the following is a specification.

This invention relates to hack saws, the object being to provideimprovements in the details of construction thereof whereby thesaw-frame is more strongly and durably secured to the saw-holding partsproper of the implement than heretofore, and the invention consists inthe details of construction having for their end the above referred topurpose, all as hereinafter fully described, and more particularlypointed out in the claim. 7

In the drawings forming part of this specification, Figure 1, is aperspective view of a hack saw embodying my improvements. Figs. 2 and 3,illustrate details of construction hereinafter described.

In the drawings,A, indicates the usual metallic frame of the saw.

B, indicates the metallic connections at the ends of the frame, A, whichcontain, each, a sleeve, d, and a frame-receiving socket-post, e, on theside of said sleeve, the open passage in said socket part extending,preferably, from its outer extremity entirely through it andcommunicating with the interior of said sleeve, d. The usual swivelbars, 71., h, are provided, one for each of said sleeves, d, between theinner ends of which the saw, is, is secured as shown. A thumb-screw, J,has the usual screw-connection with the swivel-bar, h, and serves toimpart the proper tension to the saw. Figs. 2 and 3 each show inlongitudinal and in cross section, the said frameconnections, B. Byreference to said last named figures, in connection with the perspectiveviews of said connections in Fig. -1, the constitution of the saidsocket-post, e, on each of said oonnections,and the means employed forconnecting the ends of the sawframe, A, thereto are clearly illustrated.

Heretofore it has been the practice, in making hack saws, to provide apost, to which each end of the saw-frame is secured, in which post isformed a slot extending in the line of the saw-blade, to receive one endof the sawframe, and the latter is therein secured by one or two pinspassing through the sides of the post and the end of the frame. Saidpins, in such construction, constitute the sole element of resistance tothe movement of the ends of the saw-frame, which movement may betermedaspecies of shear-movement against the said pins which tends tocut them off when great strain is put upon thesaW-blade. All of saidinconveniences are obviated by the within described improvements inconnecting the ends of the frame, A, with the sleeves, d, by means ofthe said socket-posts, 6. These posts have the sockets therein made toconform to the shape of the end of the frame which it is to receive,preferably by means of a drifting-punch which is forced through saidsocket inwardly, which punch, in form, conforms to the shape of saidframeends. Thus said ends are so closely fitted in said posts that nostrain that may be put upon the saw, can produce any movement of the endof the saw-frame in its socket, for said end is so firmly braced at thepoints, 3, and 4, (Fig. 1) that it can have no movement whatever in thedirections of the arrows there shown.

The pin, .2, through the post, 6, serves simply to prevent the end ofthe frame from being pulled out of the socket.

What I claim as my invention is In a hack-saw, a connection, B, to whichthe end of the saw-frame is secured, consisting of a hollow sleeve, 01,having thereon between its extremities, a hollow, laterally extendingpost, 6, having a passage therethrough inclosed on all sides from itsoutward extremity to the interior of said sleeve, to receive the end ofthe saw-frame, said post being integral with said sleeve, combined withsaid frame and one or more transverse pins passing through said post andframe-end, substantially as set forth.

LEONARD L. DAVIS. Witnesses:

H. A. GHAPIN, WM. S. BELLOWS.

